43242187 has 2 divisors, whose sum is σ = 43242188. Its totient is φ = 43242186.

The previous prime is 43242149. The next prime is 43242211. The reversal of 43242187 is 78124234.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43242187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43242487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621093 + 21621094.

It is an arithmetic number, because the mean of its divisors is an integer number (21621094).

Almost surely, 2^43242187 is an apocalyptic number.

43242187 is a deficient number, since it is larger than the sum of its proper divisors (1).

43242187 is an equidigital number, since it uses as much as digits as its factorization.

43242187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 43242187 is about 6575.8791807636. The cubic root of 43242187 is about 350.9963095150.

The spelling of 43242187 in words is "forty-three million, two hundred forty-two thousand, one hundred eighty-seven".